/**
 * Copyright 2016 vip.com.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 *  the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 * </p>
 **/

package com.vip.saturn.job.sharding.listener;

import org.apache.curator.framework.recipes.cache.TreeCacheEvent;
import org.apache.curator.framework.recipes.cache.TreeCacheEvent.Type;

import com.vip.saturn.job.sharding.node.SaturnExecutorsNode;
import com.vip.saturn.job.sharding.service.NamespaceShardingService;

/**
 * 
 * @author chembo.huang
 *
 */
public class JobConfigTriggerShardingListener extends AbstractTreeCacheListener {

	private String jobName;
	private NamespaceShardingService namespaceShardingService;
	private String enabledPath;
	private String forceShardPath;

	public JobConfigTriggerShardingListener(String jobName, NamespaceShardingService namespaceShardingService) {
		this.jobName = jobName;
		this.namespaceShardingService = namespaceShardingService;
		this.enabledPath = SaturnExecutorsNode.getJobConfigEnableNodePath(jobName);
		this.forceShardPath = SaturnExecutorsNode.getJobConfigForceShardNodePath(jobName);
	}

	@Override
	public void childEvent(Type type, String path, String nodeData) throws Exception {
		if (isJobEnabledPath(type, path)) {
			if (Boolean.parseBoolean(nodeData)) {
				namespaceShardingService.asyncShardingWhenJobEnable(jobName);
			} else {
				namespaceShardingService.asyncShardingWhenJobDisable(jobName);
			}
		} else if (isForceShardJob(type, path)) {
			namespaceShardingService.asyncShardingWhenJobForceShard(jobName);
		}
	}

	private boolean isJobEnabledPath(TreeCacheEvent.Type type, String path) {
		return type == TreeCacheEvent.Type.NODE_UPDATED && path.equals(enabledPath);
	}

	private boolean isForceShardJob(TreeCacheEvent.Type type, String path) {
		return type == TreeCacheEvent.Type.NODE_ADDED && path.equals(forceShardPath);
	}
}
